Staff from Kerry County Council and the fire service are at the scene of an eleven mile long oil slick outside Killarney.
The spillage stretches from Lissivigeen roundabout via Barraduff to Rathmore.
Gardaí are warning motorists driving on that road to take extra care.
The slick occurred before 10am and emergency services are at the scene trying to treat the spillage.
Separately, there’s been a crash in the area in the past hour.
Gardaí say it was a minor collision involving one car and the scene has now been cleared.